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The fuse rating is expressed in terms of

current
kVA
voltage
VAR

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

sf6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker

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Current chopping mainly occurs in

air-blast circuit breaker
sf 6 circuit breaker
oil circuit breaker
vaccum circuit breaker

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The operating time of a fuse is about

1 sec
0.002 sec
0.8 sec
1.5 sec

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A fuse element is generally made of

steel
iron
brass
silver

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The voltage appearing across the contacts after opening of the circuit breaker is called

recovery voltage
arc voltage
operating voltage
surge voltage

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